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USSD (Unstructured Supplementary Service Data) is a Global System for Mobile Communications (GSM) protocol that is used to send text messages. IT is also known as USSD centre.

(USSD) Unstructured Supplementary Service Data, is like a messaging system for mobile phones, specifically those using GSM technology. It is kind of similar to regular text messages (SMS). With USSD, users can directly connect with their mobile phones by choosing options from different menus.

The cool thing about USSD is that it creates an instant connection while you're using it. Imagine having a live chat instead of sending a message and waiting for a reply. This makes USSD great for quick back-and-forth communication. You can use USSD for things like browsing the internet, handling mobile money, checking your prepaid balance, getting menu-based information, or even accessing location-based services.

When you send a USSD message, it sets up a real-time talk between your phone and another device, usually a network or server. This chat stays open as long as you're using it, allowing for almost instant questions and answers. And remember, each USSD message can be up to 182 characters long, giving you a decent amount of space for your messages.

How USSD works

USSD (Unstructured Supplementary Service Data) works like a quick chat between your mobile phone and the network or server it's connected to. Here's a simple breakdown of how USSD works.

Dialling a USSD Code: You start by dialling a USSD code on your mobile phone. This code usually begins with an asterisk (*) and ends with a hash (#).
Initiating a Session:When you dial the USSD code then it triggers a session between your phone and the network or server.
Interactive Menu:The network or server sends an interactive menu to your phone. This menu contains options you can choose from, like checking your balance or activating a service.
User Interaction:You make selections by choosing the corresponding numbers on your phone's keypad. Each selection corresponds to a specific action or query.
Real-Time Connection:Unlike traditional text messages (SMS), USSD creates a real-time connection between your phone and the network. This means the conversation happens instantly, without delays.
Exchange of Information:As you make selections, your phone and the network exchange information. This could involve checking your balance, processing a transaction, or retrieving data based on your choices
Session Closure:Once you've completed your interaction, the USSD session is closed. The real-time connection is ended until you initiate another USSD session.

USSD Gateway

A USSD gateway plays a important role in the USSD (Unstructured Supplementary Service Data) technology setup, serving as a link between mobile phones and applications or services on a mobile network. Here's a simplified breakdown:

User Initiation:You start a USSD session by dialling a specific code on your mobile phone. This might be to check your balance, use mobile banking, or access other USSD-enabled services.
Mobile Network Transmission:Your phone's USSD message travels through the mobile network to reach the USSD gateway. This gateway is essentially a server that handles USSD sessions.
USSD Gateway Processing:The USSD gateway processes your request and interacts with the relevant application or service on the network. It understands your menu choices and triggers the necessary actions.
Interaction with Application:The USSD gateway communicates with the specific application or service you've requested. For example, if you're checking your prepaid balance, it connects with the system holding that information.
Real-Time Connectivity:USSD operates in real-time, setting up an interactive session between your phone and the application. This means you get instant responses as you make selections.
Response to Your Phone:As you make selections, your phone and the network exchange information. This could involve checking your balance, processing a transaction, or retrieving data based on your choices
Session Conclusion:Once your interaction is complete, the USSD gateway closes the session. The real-time connection ends until you initiate another USSD session.